Leopoldo Dante Tévez (known as Leo Dan; March 22, 1942 – January 1, 2025) was an Argentine composer and singer. He recorded more than 20 albums during his long career during the late 20th century betw
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cea7787e2d8cc947adf7b3c310e579c34be579e44f5de9aa072a965f5c06b0a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/956b2214-e593-4d78-938e-afd1e72b8774.json and https://artists.proofprofile.net/proofs/artist/956b2214-e593-4d78-938e-afd1e72b8774.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Celebrando a una Leyenda, Segunda Parte (En Vivo)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8435ddd319b5d820507688fe79e230506621116f9982938c544f830bdbcf83ff. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27979e990faabe34c3df8c2ac26a4d170ae0c0fbee0bcdfa817651a28830a7d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c6cc3cd606693450ca385c939d0a69d59ce42108de0658778e03eff76ab262. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e93e63479b39a3cea4d8ab9c1089ec8c4b2ef00c8d79bc5c7cae875ff53301b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6415a688af2d59312e5fa5eebe6f367bd338364f447826c1bfce4eef4decdfaa. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7059d86f7593bc803353a655abfb8d9ffac64cbe39298b0106dc6ec6a8fdec. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000052.
Cuánto Me Cuesta (Me Cuesta Ponerle Letra) - En Vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee5afa94880d6fdef9688f7f96fd1dcac708d7ed0fce6d620c354bfe1f81e1b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f0f678596f9c3287cef489279e2c4a1a2e09d6f0acb31e3fd08958c5438ffc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000054.
El Radio Está Tocando Tu Canción - En Vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e4d13181b4c5685d498a6a9470f2893fc360a15d4b5368c0eb563e087c1ccd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcf83c16925166803b5adec67356c2be02e3030146d0002d6fe731d59eacd15. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4855476c31ebcac9680b5db7b11bcf36d345466d1b1dc22cda8e7c54c0927fee. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ade648a2e7de9cb58b47c9c23bd24cdbc187671ffb989e05bd9c07fdd4a035. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e38845d43f2ed5ed113a62e29593093916f67418521f0b7de11f6757f5d222. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b73914c92b3807cfdaf8bf6b85e31b0e1e3b4b9631fbe1e58c1e84656fb2336. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf666351b468d74efe61460c5f97470cb95774221f166d7f5f1f7019bd690f95. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000061.
Tú Llegaste Cuando Menos Te Esperaba - En Vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f4976ea5b345452fd917842b830d4f6fb772520e91a05f420c87288b74ffdc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012000062.
Niña Qué Tienen Tus Ojos / Qué Cosa Linda Mi Amor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf382e625cdcf06bb7000816ec48457d1b151cc38c3f309185bfc66895439405. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG991021245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341a19c0c00e9af60b201baa9ab9abcd3d5a0b373323b62c0d874854551fdfc5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXF012301252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7c2359bab51cd748383cca51e70fb071d403b82ca49848a99e8d26656e51f6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARF109400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c044da8389ce31b8bb99f533544aa5b8c124acaa157933b48fe853eeb2dcc1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG991030730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbeee81610482595e751acc1dc65a12f00e31ca4df16d0d816d6f1d7901088e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG991030731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd466adf64b7224711e6098bafde6cb5d4af31c25dea231f3398418e4af943ebd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG991030733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2f9e81ae892b87546dc5405bcd9b467b7cd6c4b5d1da00e55fac88a7c88f5b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:39:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG991030729.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb335645014b6a0a4b1727c50c378eb1231376c745bc424c9aac972674b8cfe20. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARF109400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc091c8f150ab20b1a267610e6e295b958187aae31e40515f869af6c6b53eb5f8. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3DF2029558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd05c3a59fe5419d7ee1b91ad676eb4e7453c05f51b2e68d73843318560fe74d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ91346505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bef45100a9058e846d7e94120a3f53b63302ccdb246afcb1f0aca40ea32ba9. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG991030734.